Wednesday
May 27, 2015

Homework Help: engineering

Posted by jim on Wednesday, August 14, 2013 at 11:17am.

A thermometer is used to measure the temperature of a gas flow through a pipe. The gas
temperature is read at 500C and the duct temperature is measured to be 350C. The thermometer
is cylindrical with a diameter of 1 mm and an intrusion length of 1 cm. It can be
assumed that the conductivity of the thermometer material is the same as stainless steel,
about 20 W/m-K. The emissivity of the thermometer tip is 02. The convective heat-transfer
coefficient between the thermometer and the gas is estimated to be 100 W/m2 -K. Estimate
the error in reading the gas temperature. Calculate the actual gas temperature.

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